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Emerald Ash Borer

Emerald ash borer (EAB), Agrilus planipennis Fairmaire, is an exotic beetle that was discovered in southeastern Michigan near Detroit in the summer of 2002. The adult beetles nibble on ash foliage but cause little damage. The larvae (the immature stage) feed on the inner bark of ash trees, disrupting the tree's ability to transport water and nutrients. Emerald ash borer probably arrived in the United States on solid wood packing material carried in cargo ships or airplanes originating in its native Asia. Emerald ash borer is also established in Windsor, Ontario, was found in Ohio in 2003, northern Indiana in 2004, northern Illinois and Maryland in 2006, western Pennsylvania and West Virginia in 2007, Wisconsin, Missouri and Virginia in the summer of 2008, Minnesota, New York, Kentucky in the spring of 2009, Iowa in the spring of 2010, Tennessee in the summer of 2010, Connecticut, Kansas, and Massachusetts in the summer of 2012, New Hampshire in the spring of 2013, North Carolina and Georgia in the summer of 2013, Colorado in the fall of 2013, New Jersey in the spring of 2014, Arkansas in the summer of 2014, Louisiana in the winter of 2015, Texas in the spring of 2016, and Nebraska and Delaware in the summer of 2016. Since its discovery, EAB has:

  • Killed hundreds of millions of ash trees in North America.
  • Caused regulatory agencies and the USDA to enforce quarantines and fines to prevent potentially infested ash trees, logs or hardwood firewood from moving out of areas where EAB occurs.
  • Cost municipalities, property owners, nursery operators and forest products industries hundreds of millions of dollars.

Recommended Resources

Initial county EAB detections in North America

PDF Map of EAB Locations
As of October 1, 2016
Click to enlarge

Changes/additions included since the September 1, 2016 map are as follows: The addition of initial county detections in: Cleveland County, AR; Bartow, Gilmer, Rabun and Union Counties, GA; Iowa County, IA; Atchison County, KS; Breckenridge, Casey and Grayson Counties, KY; Dodge County, MN; Essex and Hunterdon Counties, NJ; Northampton County, PA; Bedford, DeKalb, Lincoln and Van Buren Counties, TN; Grayson and Russell Counties, VA. Added to the list of counties quarantined by their state: Dodge and St. Louis (partial) Counties, MN; Bedford, Cannon, Coffee, DeKalb, Grundy, Lincoln, Moore, Sequatchie, Van Buren & Warren Counties, TN. Additions to the Federal EAB quarantine since the September 1 map: Kent, New Castle and Sussex Counties, DE; Dodge and St. Louis (partial) Counties, MN; Bedford, Cannon, Coffee, DeKalb, Grundy, Lincoln, Moore, Sequatchie, Van Buren & Warren Counties, TN.

EAB University

EAB University

Head back to school to learn the latest about what is being done to address emerald ash borer and other invasive species in North America.

Next session:
Characteristics of Trees Used to Replacement Ash
Bob Schutzki, Michigan State University
Tuesday, November 8, 2016 at 11:00am ET

Important Information

Insecticide Options for Protecting Ash Trees
June 2014 - Second Edition

Insecticide Options for Protecting Ash Trees cover

Many homeowners, arborists and tree care professionals want to protect valuable ash trees from EAB. Scientists have learned much about this insect and methods to protect ash trees since 2002. This bulletin is designed to answer frequently asked questions and provide the most current information on insecticide options for controlling EAB.

Coalition for Urban Ash Tree Conservation EAB Management Statement

This document is an endorsement for ash tree conservation as part of integrated approach to managing emerald ash borer in urban areas, and is supported by university scientists with expertise in EAB management, commercial arborists, municipal foresters, public works officials, and non-governmental organizations (NGOs).

Additional Letters of Support

What To Know About EAB

adult eab
Adult Beetles are metallic green and about 1/2-inch long.
It attacks only ash trees (Fraxinus spp.)
d-shaped exit hole
Adults leave a D-shaped exit hole in the bark when they emerge in spring.
Woodpeckers like EAB larvae; heavy woodpecker damage on ash trees may be a sign of infestation.
Firewood cannot be moved in many areas because of the EAB quarantine.
packing crate
It probably came from Asia in wood packing material.

News & Information

Get the most current information about emerald ash borer from our popular EAB University webinars or follow us on Twitter for the latest news about EAB.

EAB University

Emerald Ash Borer University
Upcoming Schedule

Characteristics of Trees Used to Replacement Ash
Bob Schutzki, Michigan State University
Tuesday, November 8, 2016 at 11:00am ET

How Tree Choice Can Cause the Next Invasive Species Disaster
John Ball, South Dakota State University
Tuesday, November 15, 2016 at 11am ET

Managing YOUR Local EAB Situation
Cliff Sadof, Department of Entomology, Purdue University
Tuesday, November 29, 2016 at 11am ET

Developing a Municipal Strategy for Managing EAB
Josh Behounek, Coordinator of Urban Forestry Services with Davey Tree Co., Columbia, MO
Tuesday, December 6, 2016 at 11:00am ET

National Perspective on EAB
Joe Beckwith, USDA APHIS
Tuesday, December 13, 2016 at 11am ET


Watch previous EAB University webinars